Jimmy Kimmel and his wife Molly McNearney welcomed their new baby and second child together, William 'Billy' Kimmel. At three days old, their son had successful open heart surgery at Children's Hospital Los Angeles and is now home with his family. Jimmy opens up about his son's birth and the condition the baby was born with called tetralogy of fallot which is a congenital heart defect. He encourages donations to Children's Hospital Los Angeles where Billy and so many other kids get such wonderful care... chla.org/donate. This is Jimmy's fourth child – he has 3 other children Kevin, Katherine and Jane.